Is 5w-50 oil any good

[jimkiler]

I came home from the local car store and thought I had 3 quarts of 5w-30 and I had 5w-50 castol syntec. I saw the bottle said improved for better performance and there were only a couple of spots for oil, did this replace 5w-30 oil. My father in law thinks this oil will be fine, even up here in MN. I already had one bottle of 5w-30 so 1 threw all 4 bottles into my Protege5.

Any one else use it?

It might be perceived but I think my engine is more quiet since I changed to this oil.

 

[nealric]

I use 5w-30 in the winter, 10w-30 in the summer- that is the reccomendation.

castrol is mediocre oil. That said, it certainly wont do any harm.
If you want the good stuff, get mobil1 or royal purple.

EDIT: I just noticed you are using 5w-50. No, dont use that. Thats not the weight that our motors are designed for.

The name scheme is used because modern motor oils are variable weight- ie. they thin out when hot. You want a lower low/side weight for winter because the motor will be very cold at start. However, you dont want to change the upper weight.

 

[Hughes412]

He's right, if you put the 50w in get it out as soon as you can. Most likely it want hurt anything but it can. The seals arn't ment for that weight oil.